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45 Eugenia

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45 Eugenia
Orbital characteristics

<tr> <td align="center" colspan="2"> Epoch J2000</td></tr><tr><th>Aphelion distance:</th> <td>2.947 AU</td></tr><tr><th>Perihelion distance:</th> <td>2.496 AU</td></tr><tr><th>Semi-major axis:</th> <td>2.722 AU</td></tr><tr><th>Eccentricity:</th> <td>0.083</td></tr><tr><th>Inclination:</th> <td>6.61°</td></tr>

45 Eugenia (ew-jee'-nee-ə (key)) is a large Main belt asteroid. It is famed as one of the first asteroids to be found to have a moon orbiting it.

Eugenia was discovered in 1857 by Hermann Goldschmidt. It was named after Empress Eugenia di Montijo, the wife of Napoleon III, and was the first asteroid to be named after a real person, rather than a figure from classical legend (although there had been controversy about whether 12 Victoria was really named for the mythological figure or for Queen Victoria).

Eugenia is a large asteroid, with a diameter of 214 km. It is an F-type asteroid, which means that it is very dark in colouring (darker than soot) with a carbonaceous composition. Like Mathilde, its density appears to be unusually low, indicating that it may be a loosely-packed rubble pile, not a monolithic object.

In 1998, astronomers at the Canada-France-Hawaii Telescope on Mauna Kea, Hawaii, discovered a small moon orbiting Eugenia. This was the first time an asteroidal moon had been discovered by a ground-based telescope. Eugenia's moon has been named (45) Eugenia I Petit-Prince, after Empress Eugenia's son, the Prince Imperial. The moon is much smaller than Eugenia, about 13 km in diameter, and takes five days to complete an orbit around it.

Aspects

Stationary,
retrograde
Opposition Distance to
Earth (AU)
Maximum
brightness (mag)
Stationary,
prograde
Conjunction
to Sun
3 April 2005 17 May 2005 1.49474 10.7 4 July 2005 18 January 2006
27 July 2006 10 September 2006 1.80136 11.2 2 November 2006 25 April 2007
20 October 2007 11 December 2007 1.94888 11.6 31 January 2008 25 July 2008
31 January 2009 19 March 2009 1.59748 10.8 2 May 2009 21 November 2009
4 June 2010 20 July 2010 1.59870 10.8 7 September 2010 12 March 2011
11 September 2011 28 October 2011 1.94967 11.6 22 December 2011 9 June 2012
6 December 2012 26 January 2013 1.79951 11.2 13 March 2013 20 September 2013
6 April 2014 21 May 2014 1.49480 10.8 7 July 2014 21 January 2015
30 July 2015 12 September 2015 1.81065 11.2 5 November 2015 26 April 2016
21 October 2016 11 December 2016 1.94505 11.6 1 February 2017 28 July 2017
4 February 2018 18 March 2018 1.58883 10.8 5 May 2018 24 November 2018
8 June 2019 26 July 2019 1.60759 10.8 10 September 2019 13 March 2020
12 September 2020 31 October 2020 1.95317 11.6 23 December 2020 11 June 2021

See also

Dactyl and Ida - Another asteroid and asteroid moon system catalogued by astronomers

External links


Minor planets
Previous minor planet 45 Eugenia Next minor planet
List of asteroids
The minor planets
Vulcanoids | Near-Earth asteroids | Main belt | Jupiter Trojans | Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud)
For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system
For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.

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